Layout copier with transfer screws and gauging driver



March 14, 1950 H. BERG LAYOUT COPIER WITH TRANSFER SCREWS AND GAUGINGDRIVER Filed June 1, 1946 Patented Mar. 14, 1950 UNITED [STATES PATENTOFFICE LAYOUT COPIEB WITH TRANSFER SCREWS AND GAUGING DRIVER Harry Berg,Detroit, Mich.

Application June 1, 1946, Serial No. 673,763

16 Claims. (Cl. 33-189) This invention relates to transfer screws andmore particularly to a combination gage and driver for adjusting thecutting surfaces of transfer screws to a uniform height.

The necessity of accurately transferring the centers of one or moretapped holes from one piece of stock to another frequently arises in themanufacture of various types of tooling. Toolmakers commonly resort tothe use of transfer screws as a simple and effective method oftransferring the location of such centers especially in the case ofso-called blind holes such as are frequently encountered in themanufacture of dies which are not-provided with flanges or the likecapable of receivingthrough holes for attaching the dies to theirrespective die shoes.

The transfer screws are commonly provided with a center punch and aconcentric drill circle which permits location of a drill to be checkedafter startin the drilling operation.

While the use of transfer screws is an expedient and highly accuratemeans for transferring the centers of a group of tapped holes from onepiece of stock to another, satisfactory results normally require thatthe marking edges of all screws used in a single transfer operation beaccurately positioned in the plane of the surface of the stock to whichthe centers are to be transferred. Otherwise, when such piece of stockis tapped with a hammer or pressed down against the transfer screws byother means, one or more of the screws will fail to leave a clearimpression. This is especially true where it is desired to use transferscrews having a concentric marking edge since the contact surface of agroup of such screws together by common studs or bolts, the adjacentcontact surfaces of such pieces most frequently lie in a flat plane. Insuch cases the positioning of the markin edges of a group of transferscrews at a uniform height relative to the plane surface of the piece inwhich the transfer screws are located will serve to cause all of suchmarking edges to lie in a plane corresponding to the surface of thepiece to which the centers are to be transferred and when such piece isbrought into contact with the transfer screws and tapped or otherwisepressed against them, each of the screws will leave a uniform and clearcentering mark.

The problem of so adjusting each of a group of transfer screws to aproperheight has heretofore presented considerable difficulty and hasresulted in a great deal of lost time in marking and re-marking thepieces to which the centers are to be transferred. Various devices havebeen used in the past to automatically locate the projecting height of atransverse screw such as the provision of a shoulder on the screw tolimit the threaded engagement to a predetermined maximum. To the best ofmy knowledge none of such-devices have included any provision forcompensating for wear in the cutting edges of the screw which nateurally result in varying the dimensions of particular screws.

It is the principal object of the present invention to provide atransfer screw, gage and driver which will permit each of a group oftransfer screws to be quickly and accurately leveled to .a position suchthat each of their cutting edges will lie at a uniform distance from thesurface of the piece in which the transfer screws are engaged.

Another object is to provide a transfer screw of the'type having acentral marking point and a concentric marking edge with a plurality ofnotches adapted to be drivingly engaged by driving lugs in the adjustinggage.

A further object is to provide a gage and driver for such transfer screwwhich is adaptable to screws havinga variety of threaded and markingedge diameters.

Another object is to provide a gage having one surface for registeringagainst the surface of the piece in which the screws are located, ayieldable surface for registering against the marking edge of thecentering screw and a means for gaging the relative displacement of suchsurfaces while the screw is simultaneously being adjusted in height.

These and other objects will appear more clear- 1y from the followingdetailed description of a particular embodiment of the invention andfroman examination of the drawings forming a part hereof, wherein Fig. 1 isa side elevation of the gage and driver assembly. 7

Fig. 2 is a sectional elevation of the gage and driver assembly.

. Fig. 3 is an end elevation of the gage and driver assembly taken alongthe line 3-3 of Fig. 1.

Fig. 4 is a fragmentary sectional side elevation of a transfer screwengaged in a blind threaded hole, the gage and driver being shownadjacent thereto in near driving relationship.

Fig. 5 is an exploded perspective view of the variouscomponents of thegage and driver.

the pin slot 24.

Referring to Figs. 2 and 5, it will be seen that the main body I I]comprises a hexagonal sleeve having a cylindrical bore II with a uniformdiameter from the top surface 42 of the sleeve to the shoulder I3 and areduced bore I4 extending from the shoulder I3 to the bottom surface I5of such sleeve. As most clearly seen in Fig. 5, a reduced cylindricalsection I6 at one end of the sleeve III is provided with radiallyextending slots I1 into which four rectangular lugs I8 are inserted witha press fit. The lower edges I 9 of the lugs I8 project longitudinallybeyond the lower edge 26 of the sleeve ID by an amount sufficient topermit such lugs to engage corresponding notches 2| formed in themarking edge 22 of a transfer screw 23, as shown in Fig. 3. Anadditional transverse slot 24 is provided in the reduced end I6 of thesleeve ID to accommodate a gaging pin 25 with sufficient clearance topermit such gaging pin to readily move within such slot.

A ring 25 is provided to fit over the end I6 of the sleeve ID with apress fit. The lower edge 21 of the ring 26 extends longitudinally belowthe bottom edge 20 of the sleeve I0 and is provided with a sufficientinternal diameter to overlie the edge 28 of the transfer screw 23,thereby permitting the edge 21 to contact the surface 29 of the piece 30in which the transfer screw is located while the lugs I8 aresimultaneously engaged with the notches 2| of the transfer screw 23. Arod 3| is provided with an enlarged cylindrical section 32 having adiameter somewhat smaller than the internal bore I I of the sleeve I 9 ipermitting the rod 3| to move downwardly within the bore I I to thepoint where the lower shoulder 1 33 contacts the shoulder I3 of thesleeve II]. A hole 34 is provided at the lower end of the rod 3| havingan axis perpendicular to that of the rod 3|. The gaging pin 25 extendsthrough the hole 34 and transmits any longitudinal movement along theaxis of the gage to the end 35 of the rod 3|. A short sleeve 36 having adiameter substantially equal to that of the section 32 of rod 1 3| isprovided with a bore 31 just large enough 3 to permit the end 35 of therod 3| to slide there,-

in. A lock screw 38 passes through a threaded hole 39 at the top end ofthe sleeve III to engage and lock the sleeve 36 in a fixed position, aspring 40 being interposed under compression between the shoulder 4| ofthe rod 3| and the shoulder 42 of the sleeve 36 thereby urging the lowershoulder 3301' rod 3| into engagement with the shoulder l3 of sleeveIII.

The respective parts of the gage and driver are normally assembled inthe following manner: The lugs I8 are first pressed into theirrespective slots II. The rod 3| is then dropped into the bore I Iwhereupon the hole 34 is aligned with The pin 25 is next insertedthrough the hole 34 and moved to a position where its ends lie withinthe outer diameter of the reduced section I6 of the sleeve I6 whereuponthe ring 26 is pressed onto the cylindrical section I6 to a positionwhere its top edge 43 engages the shoulder 44 of the sleeve I6. In thisposition the lateral movement of the pin 25 is limited by the ring 26and the longitudinal movement of the rod 3| is limited in one directionby the engagement of its shoulder 33 with the shoulder I3 of sleeve I I]and in the opposite direction by the contact of pin 25 with the upperend of its slot 24 coinciding with the shoulder 44 of the sleeve |6. Thelength of the lower end 45 of the rod 3| and the location of, the hole34 are such as to permit the 4 the lower surface 28 of the sleeve III inwhich position it may contact the concentric marking edge 22 of atransfer screw 23 at two points.

After the ring 26 has been positioned, the spring 40 is dropped onto therod 3| and the sleeve 36 is then slipped over the end 35 of the rod 3|to a suitable position compressing the spring 40. The lock screw 38 isthen tightened against the sleeve 36 completing assembly of the gage.The respective parts are dimensioned and positioned in assembly so thatthe end 35 of rod 3| will normally lie within the sleeve 36 somewhatbelow the upper surface 48 of such sleeve. The normal limits of themovement of rod 3| and the pin 25, as may be effected by the contact ofthe pin 25 with the marking edge of a transfer screw 23, permit the end35 to move up beyond the surface 48 of the sleeve 36.

As shown in Figs. 2 and 3, the lower end 45 of the rod 3| isprovided'with an internal conical chamfer 46 which communicates with thehole 34, thereby providing clearance for the centering point 41 of thetransfer screw 23, the apex of which normally lies in the plane of themarkin edge 22.

As previously mentioned, the lower edge 21 of the ring 26, the loweredges I9 of the lugs I8, and the pin 25 in'its normal position allextend longitudinally beyond the lower end I5 of the sleeve It]. Inoperation a transfer screw 23 is started into a threaded hole, such asthe blind hole 49 shown in Fig. 4, by hand. The gage and driver is thenbrought into driving position over the screw with thelugs I8 engaged inthe notches 2|. At this point of full driving engagement, the markingedge 22 of a transfer screw 23 will have moved the pin 25 and rod 3|against the pressure of spring 46 to a position where the end 35 of therod 3| will extend beyond the top surface 48 of the sleeve 36. Thesleeve I0 is thereupon rotated by hand or by a tool if necessary untilthe lower edge 21 of the ring 26 contacts the upper surface 29 of thepiece of stock 36. Continued rotation of the sleeve II] will now produceseveral effects since the transfer screw will continue to move downwardinto its hole while the movement of the gage and driver is arrested bythe contact of ring 26 with the surface 29. The lugs I8 will withdrawsomewhat from the notches 2 I, not sufficiently' however to preventcontinued driving engagement for a certain limited distance. As thescrew begins to move downward relative to the main body of the gage, thepin 25 will continue in contact with the marking edge 22 indicating suchrelative movement by a like relative movement between the top end 35 ofthe rod 3| and the upper surface 43 of the sleeve 36. The sleeve 36 willnormally be adjusted to a position where the top surface 35 of rod 3|will become flush with the top surface 43 of the sleeve 36 when themarking surface 22 of the transfer screw 23 is at the desired heightabove the surface 29 of the piece 30. The depth of the notches 2| andthe position of the bottom surfaces I9 of the lugs I8 are such as topermit driving engagement to be maintained while the surfaces 35 and 48are brought into flush relationship.

In this manner an extremely accurate adjustment in the level of themarking edge 22 can very quickly be made with the combination driver andgage. It will be noted that since the marking edge itself is used as agaging surface, compensation for any wear in such edge willautomatically be made in-leveling the transfer screws. It will pin 25 inits normal position to extend beyond also be noted-that the use of fourdriving lugs and four notches in the transfer screw causes the gage anddriver to be self-centering when brought into engagement with thetransfer screw. This arrangement permits a single gage and driver to beused in adjusting transfer screws having a variety of diameters as longas they are within the maximum diameter determined by the size of thering 26.

This combination gage and driver has been thoroughly tested in practiceand found to be a highly effective answer to the long existing need foran accurate and efficient means for leveling transfer screws.

While a particular embodiment of the present invention hasbeen describedin detail, it will be understood that numerous changes-in the design andconstructiondetailscould be made without departing from thespirit of theinvention, as set forth in the following claims.

I claim:

l. A transfer screw gage for adjusting a plurality of transfer screws toa uniform level relative to the plane surface of a piece of stock havinga plurality of threaded holes substantially normal to said plane surfacecharacterized by a gage surface for registering with said plane surface,a yieldable member for registering with a portion of said transferscrews indicative of the height of the marking portion of said transferscrews relative to said plane surface, means for gaging the position ofsaid yieldable member relative to said registering surface, and a screwdriving element for drivingly. engaging one of said screws while saidrespective gage surface and yieldable member remain in contact'with saidplane surface and transfer screw,

2. In combination, a transfer screw provided with a notched face adaptedto be drivingly engaged by a driving tool, a transfer screw gage anddriver for adjusting a plurality of said transfer screws to a uniformlevel relative to a plane surface of a piece of stock having a pluralityof threaded holes substantially normal to said plane surface comprisinga gage surface for registering with said plane surface, a yieldablemember for registering with a portion of each of said transfer screwsindicative of the height of the marking portion of said transfer screwrelative to said plane surface, means for gaging the position of saidyieldable member-relative to said registering surface, and driving meansfor simultaneously engaging said notched face. 1 r

3. A transfer screw gage for use in adjusting a plurality of transferscrews to a uniform level relative to the plane surface of a piece ofstock having a plurality of threaded holes substantially normal to saidplane surface characterized by a gage surface for registering with saidplane surface, a yieldable member for registering with a marking portionof said transfer screw, means for gaging the position of said yield-ablemember relative to said registering surface, and a screw driving elementfordrivingly engaging one of said screws while said respective gagesurface and yieldable member remain in contact with said plane surfaceand transfer screw.

4. A transfer screw gage for. use in adjusting each of a plurality oftransfer screws of the type having a centralmarking point and aconcentric marking edge to a uniform level relative to a plane surfaceof a piece of stock having a plurality of threaded holes substantiallynormal to said plane surface, said gage being characterized by a gagesurface for registering-with said plane surface, a yieldable member forregistering with the concentric marking edge of said transfer screws,means for gaging the position of said yieldable member relative to saidregistering surface, and a screw driving element for drivingly engagingone of said screws while said respective gage surface and yieldablemember remain in contact with said plane surface and transfer screw.

5. A transfer screw gage, as set forth in claim 4, wherein the means forgaging the position of said yieldable member relative to saidregistering surface comprises a sleeve having a fixed relationship withsaid registering surface, and a rod having a fixed relationship withsaid yieldable member and slidably received within said sleeve, said rodnormally extending to a point within said sleeve adjacent the outer endthereof and being movable through the contact of said yieldable memberwith said transfer screw marking edge to a point beyond said end of thesleeve.

'6. A transfer screw gage for use in adjusting each of a plurality of,transfer screws of the type having a central marking point and aconcentric marking edge to a uniform level relative to the plane surfaceof a piece of stock having a plurality of threaded holes substantiallynormal to said plane surface, said gage comprising an annular ring ofsufficient diameter to permit it to overlie the said marking edge of atransfer screw, a sleeve in fixed relationship with said ring, acrosspin fitting within said ring for contacting said concentric markingedge of a transfer screw at two points, a rod having a fixedrelationship with said crosspin and slidably received within saidsleeve, said rod and crosspin being movable between fixed limits withinand relative to said I sleeve and ring, and means for urging said rodand crosspin toward one of said limits, said rod normally extending to apoint within said sleeve adiacent the outer end thereof and beingmovable through the contact of said crosspin with said transfer screwmarking edge to a pointbe yond said end of the sleeve.

7. In combination, a transfer screw of the type having a central markingpoint and a concentric rnarking edge, a plurality of notches in saidmarking edge adapted to be drivingly engaged, and a transfer screw gageand driver for adjusting a plurality of said transfer screws to auniform level relative to'a plane surface of a piece of stock having aplurality of threaded holes substantially normal to said plane surface,said gage and driver comprising a gage surface for registering with saidplane surface, a yieldable member for registering with a portion of eachof said transfer screws indicative of the height of the marking portionof said transfer screw relative to said plane surface, means for gagingthe position of said yieldable member relative to said registeringsurface, a plurality of lugs for engaging said notches, and agrip'pingsurface in fixed relationship with said lugs adaptable to be grasped andturned by hand or suitable tool.

8. In combination, a transfer screw provided with a marking face adaptedto'be drivingly engaged and rotated by a driving tool, a transfer screwgage and driver for adjusting a plurality of said transfer screws to auniform level relative to a plane surface of a piece of stock having aplurality of threaded holes substantially normal to said plane surface,said gage being provided with a surface for registering with said planesurface, a yieldable member for registering with a portion of each ofsaid transfer screws indicative of the height of-the marking portion ofsaid transfer screw relative to said plane surface,

means for gaging the position of said yieldable member relative to saidregistering surface, and driving means for simultaneously engaging saidmarking face.

9. In combination, a transfer screw provided with a marking face adaptedto be drivingly engaged and rotated by a driving tool, a transfer Iscrew gage and driver for adjusting a plurality of said transfer screwsto a uniform level relative to a plane surface of a piece of stockhaving a plurality of threaded holes substantially normal to said planesurface, said gage being provided l with a surface for registering withsaid plane surface, a yieldable member for registering with a centricmarking edge, said transfer screw being 1 provided with a marking faceadapted to be drivingly engaged and rotated by a driving tool,

a transfer screw gage and driver for adjusting a plurality of saidtransfer: screws toa uniform level relative to a plane surface of apiece of stock having a plurality of threaded holes substantially normalto said plane surface, said gage being provided with a surface forregistering with said plane surface, a yieldable member for registeringwith the concentric marking edge of said I transfer screw, means forgaging the position of said yieldable member relative to saidregistering surface, and driving means for simultaneously engaging saidmarking-face.

11. In combination, a transfer screw of the centric marking edge, saidtransfer screw being provided with a marking face adapted to bedrivingly engaged and rotated by a driving tool, a transfer screw gageand driver for adjusting a plurality of said transfer screws to auniform level relative to a plane surface of a piece of stock having aplurality of threaded holes substantially normal to said plane surface,said gage and driver comprising an annular ring of sufficient diameterto permit it to overlie said marking edge of a transfer screw and toregister with said plane surface, a crosspin fitting within and typehaving a central marking point and a coni I type having a centralmarking point and'a conmovable relative to said ring for contacting saidmarking edge at two points, means for gaging the position of saidcrosspin relative to said annular ring, and driving means forsimultaneously engaging said marking facer 12. In combination, atransfer screw of the type having a central marking point and aconcentric marking edge, a plurality of notches in said marking edgeadapted to be drivingly engaged, and a transfer screw gage and driverfor adjusting a plurality of said transfer screws to a uniform levelrelative to a plane surface of a l piece of stock having a plurality ofthreaded holes substantially normal to said plane surface, said gage anddriver comprising an annular ring of sufficient diameter to permit it tooverlie said marking edge of a transfer screw and to register with saidplane surface, a crosspin fitting within 1 and movable relative to saidring for contacting said marking edge at two points, a plurality of lugsfor engaging said notches, and a gripping surface in fixed relationshipwith said lugs adapted to be grasped and turned by hand or suitabletool.

13. In combination, a transfer screw of the type having a centralmarking point'and'a concentric marking edge, a plurality of notches insaid marking edge adapted to'be' drivingly engaged by a rotary drivingtool, and a combination gage and driver for adjusting the marking edgesof a plurality of said transfer screws, the

size of which may vary in diameter, to a uniform level relative to aplane surface of a piece of stock having a plurality 'of threaded holesof corresponding diameter substantially normal t; said plane surface,said gage and driver comprising an annular ring of sufi'icient diameterto permit it to overlie the marking edge of the largest of said transferscrews and to register with said plane surface, a gage sleeve havingfixed relationship with said ring, said sleeve being provided with aplurality of driving lugs lo cated within said ring for engaging saidnotches in each transfer screw, a rod slidable within said sleeve, acrosspin located within said ring and connected to said rod forcontacting said marking edge of each transfer screw, said rod andcrosspin being movable between fixed limits within and relative to saidsleeve and ring, spring means for urging said rod and crosspin towardone of said limits, said rod normally extending to a point within saidsleeve adjacent the outer end thereof and being movable through thecontact of said crosspin with said transfer screw marking edge to apoint beyond the end of said. sleeve.

14. A device for the continuous and simultaneous adjustment and gagingof the level of the marking edge of a transfer screw above the surfaceof a part into which said screw is threaded comprising a member adaptedto continuously register against the surface of said part, a memberadapted to continuously register against the marking edge of said screw,gaging elements as- I' sociated with each of said members for indicatingtheir relative position, and a screw driving element forming a part ofsaid device fordrivingly engaging said screw while said members remainrespectively in registration with said surface and edge. 1

15. A device as set forth in claim 14 wherein said screw driving elementhas a fixed relationship with said first mentioned member.

16. A device as set forth in claim 14 wherein a bore is provided withinthe gaging element associated with said first mentioned member, thegaging element associated with said second mentioned member beingslidably housed within said bore, and wherein end surfaces of therespective gaging elements are adapted to indicate by both sight andfeel the relative position of said members. Y

HARRY BERG.

REFERENCES CITED The following references are of record in the file ofthis patent! UNITED STATES PATENTS Number Name Date 1,743,461 La ForceJan. 14, 1930 2,092,653 Nielson Sept. 7, 1937 2,242,151 Sisson May 13,1941 2,287,273 Rabb June 23, 1942 2,400,371 Reeser May 14, 1946.2,426,955 Stroup Sept. 2, 1947 FOREIGN PATENTS Number Country Date74,645 Switzerland Mar. 16, 1917

